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Table 2 Contributions to Concentration indices (CC) and its percent contributions (shown in brackets) comparing two reference sets for Ordinary Least Squares (OLS), Probit and Generalized Linear Model (GLM) with binomial distribution and identity link

From: Decomposing socioeconomic inequality for binary health outcomes: an improved estimation that does not vary by choice of reference group

Groups OLS (%)
Reference 1*
OLS (%)
Reference 2*
Probit (%)
Reference 1
Probit (%)
Reference 2
GLM (%)
Reference 1
GLM (%)
Reference 2
Males 15-29 ref -0.007 (7.0) ref -0.005 (4.5) ref -0.007 (7.0)
Males 30-44 0.002 (-1.7) -0.015 (14.6) 0.003 (-2.6) -0.010 (9.3) 0.002 (-1.6) -0.015 (14.6)
Males 45-59 0.003 (-2.4) -0.005 (4.8) 0.003 (-3.2) -0.003 (3.0) 0.002 (-2.3) -0.005 (4.8)
Males 60+ -0.016 (15.2) 0.006 (-6.1) -0.020 (18.7) 0.004 (-4.1) -0.016 (15.1) 0.006 (-6.1)
Females 15-29 0.001 (-0.7) -0.005 (5.1) 0.001 (-1.0) -0.004 (3.4) 0.001 (-0.6) -0.005 (5.1)
Females 30-44 0.005 (-4.7) -0.010 (9.8) 0.007 (-6.3) -0.007 (6.5) 0.005 (-4.5) -0.011 (10.0)
Females 45-59 -0.001 (0.9) 0.001 (-0.7) -0.001 (1.1) 0.000 (-0.5) -0.001 (0.9) 0.001 (-0.7)
Females 60+ -0.029 (27.9) ref -0.034 (32.2) ref -0.029 (27.8) ref
Subtotal -0.036 (34.5) -0.036 (34.5) -0.041 (39.0) -0.023 (22.1) -0.037 (34.7) -0.037 (34.7)
No education -0.005 (4.6) ref -0.005 (5.0) ref -0.004 (3.4) ref
Primary -0.018 (17.1) 0.002 (-1.6) -0.019 (18.3) 0.000 (-0.3) -0.014 (13.2) 0.001 (-0.7)
High school 0.002 (-2.1) -0.007 (6.3) 0.002 (-2.0) -0.007 (6.2) 0.001 (-0.8) -0.006 (5.4)
Higher ref -0.016 (15.0) Ref -0.015 (14.0) ref -0.012 (11.2)
Subtotal -0.021 (19.7) -0.021 (19.7) -0.022 (21.3) -0.021 (19.9) -0.017 (15.9) -0.017 (15.9)
Bangkok ref -0.039 (37.0) Ref -0.034 (32.4) ref -0.038 (36.2)
Central 0.001 (-1.3) -0.018 (17.2) 0.002 (-1.9) -0.016 (15.1) 0.003 (-2.4) -0.016 (15.6)
North -0.016 (15.1) ref -0.017 (16.3) ref -0.016 (14.8) ref
Northeast -0.007 (6.9) 0.037 (-34.7) -0.008 (8.0) 0.034 (-31.9) -0.007 (6.2) 0.036 (-34.5)
South 0.001 (-0.6) -0.001 (0.7) 0.001 (-0.7) -0.001 (0.6) 0.001 (-0.6) -0.001 (0.7)
Subtotal -0.021 (20.2) -0.021 (20.2) -0.023 (21.8) -0.017 (16.1) -0.019 (18.0) -0.019 (18.0)
ΣCC -0.078 (74.3) -0.078 (74.3) -0.086 (82.0) -0.061 (58.2) -0.072 (68.6) -0.072 (68.6)
Residual -0.027 (25.7) -0.027 (25.7) -0.019 (18.0) -0.044 (41.8) -0.033 (31.4) -0.033 (31.4)
Overall C -0.105 -0.105 -0.105 -0.105 -0.105 -0.105
  1. Source: Thai Health and Welfare Survey 2003
  2. *Reference values used in set 1 are: males aged 15-29, higher education, Bangkok.
  3. *Reference values used in set 2 are: females aged 60+, no education, North.